Heating strip
The heating strip or skirting heating strip is a radiator for rooms in buildings. They usually runs on the inside of outer walls close to the floor and is part of a skirting heating , which also baseboard heater or edge strips heating is called. The Coanda effect is intended to ensure that the room air heated by the heating strips rises close to the wall and warms the wall surface. From there, heat is given off into the interior in the form of thermal radiation . As long as the convective ascent of the warm air along the wall surface is guaranteed, the skirting board heating works like a wall heating system and has largely the same building physics , building climatic and physiological advantages.
The skirting board heating generally takes up little space, can be easily retrofitted in the renovation of old buildings and, due to its low height, is very suitable for space-saving installation under sloping ceilings, even in narrow attic apartments.
By cladding the pipes, direct heat radiation is reduced. On the other hand, cladding that is open at the top and bottom can increase the heat dissipation through convection , so that the wall surface above also heats up more and in turn radiates heat.
The skirting board heating is also used in the renovation of old buildings and monument preservation
- to prevent the rise of soil moisture through masonry ("thermal horizontal barrier " ),
- to reduce the moisture content of the walls and the structure as a whole - this increases the heat transfer resistance of the outer wall and the activity of wood pests and dry rot is stopped - and
- to reduce the (summer) condensation of the humidity contained in warm air on the cool masonry.
If the goal is only to reduce the building moisture or to bring the interior temperature of the building to an even level (e.g. for the conservation of architectural monuments), this type of skirting board heating is also known as temperature control or envelope surface temperature control . If the focus is on dehumidifying the building, the heating pipes should be laid concealed or at least in contact with the outer wall.
Compared to direct heating of the wall surface
Compared to wall heating systems installed under plaster , a little less energy is lost through the outer wall with skirting board systems, as the rising air is initially heated and the wall surface remains a few degrees colder due to the heat transfer resistance. Physiologically, this can be disadvantageous, since in order to create a healthy indoor climate and optimal well-being, the aim should be to keep the air temperature below the wall temperature. However, the temperature differences between these two systems are usually relatively small. The difference is more pronounced with conventional convector heating : Here the air temperatures are usually noticeably higher, while the outer wall remains colder.
Heating strips must be operated with a higher flow temperature than wall heating systems integrated into the wall surface in order to get the necessary convection going. The strips are therefore less suitable for use with heat pumps or solar heating support , which work significantly more efficiently at low flow temperatures. In particular, with poorly insulated external walls, the heat losses through plastered-in heating registers can be considerable, so that in this case heating strips usually work more energy-efficiently despite the higher flow temperatures required.
The cladding of the heating strips can be more or less noticeable depending on the design. (If the fastening system of the skirting boards is attached before the wall surface is plastered, the cladding will be one to two centimeters less after the plastering has been completed.) Heating strips have the advantage that they cannot be accidentally perforated when attaching pictures or shelves, as is the case with heating systems under the plaster.
Due to the height and depth of the heating strip cladding, furniture can only be pushed up to the outer wall if a special recess is provided in the rear wall of the piece of furniture for the strip. However, since pieces of furniture should not be pushed all the way up to the outside wall in order to avoid mold formation in winter, this circumstance should generally not be regarded as a disadvantage. In order to allow the heated air to circulate, the paneling of the heating strips behind pieces of furniture should, if possible, not only be open towards the front, but also towards the top. Even with plastered wall heating systems, it is advisable to leave a certain distance behind furniture so that the air warmed up on the wall surface can rise.
species
Electric heating strips
Heating rods are built into these , which are heated by the current flowing through them. In order to increase the heat dissipation, the heating rods are usually equipped with ribs or fins.
Water-bearing heating strips
The usual design consists of water-carrying pipes, which are usually made of copper and are covered from the front and from above by a panel. The fairing has openings through which the heated air flows. In order to achieve a higher heat emission from the pipes, their surface is enlarged by means of ribs or a wire mesh.
Skirting boards made of hollow chamber profiles are also offered , which radiate heat directly and do not allow air to flow through them.
Mesh tubes
In the case of mesh pipes, a cylindrical wire mesh is pushed over the pipe and soldered to it. The cleaning of net pipes is best done with a long-haired hand brush or with compressed air.
Finned tubes
To manufacture finned tubes, round or angular sheet metal sections are pressed or soldered to the tube in a lamellar shape.
In workshops and other commercially used rooms, exposed steel pipes with molded sheet metal disks or sheet metal screws coiled around the pipe, which were additionally corrugated on the inner edge, were used in the past. This improves the heat emission, but makes cleaning a little more difficult.
Nowadays, finned tubes with many fine fins are available in living areas, which enable efficient operation even with low flow temperatures .
In order to limit the size of the cladding, predominantly rectangular slats are offered, more rarely also round slats, the cross-section of which is narrowed in some designs by folding over or separating the edges of the slats on both sides.
Typical heat outputs are 100 watts per meter of finned pipe length at a flow temperature of 45 ° C up to 300 watts at a flow temperature of 70 ° C. The highest achievable outputs are 300 or 600 W.
Hollow chamber profiles
In addition to the heating strips that work according to the convector principle, there are also heat-radiating hollow-chamber profiles that look very similar to ordinary skirting boards and are installed along the outer walls instead of them. The directly heated skirting boards are usually higher than ordinary skirting boards in order to be able to radiate enough heat into the room. The hollow chamber profiles are usually made of aluminum and the heating water flows directly through them. They require slightly higher flow temperatures in order to achieve a heating output comparable to that of finned tube systems.
Individual evidence
- ↑ Heating strips come from the company Neue Sancal Gesellschaft für Strahlwärme mbH
- ↑ Henning Großeschmidt: The temperature-controlled house: Refurbished architecture - comfortable rooms - "large display case"
- ↑ Radiasancal heating strips with 300 W / m, the heating registers are pushed over the electric heating rods after installation.
- ↑ The heat outputs specified by the manufacturers are not necessarily comparable, as the type of cladding has a major influence on the heat dissipation and often no information is given as to whether measurements were taken with or without cladding: AKG heating strips depending on the model at 45 ° C Flow temperature approx. 100–230 W / m and at 70 ° C flow temperature 230–630 W / m; Climate board USH Innovations ( Memento of the original from June 26, 2017 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. at 45 ° C flow temperature 100 W / m and at 70 ° C flow temperature 280 W / m; Sancal heating strips depending on the model at a flow temperature of 45 ° C 180/220/285 W / m and at a flow temperature of 70 ° C 340–540 W / m; Sandomus heating register, depending on the model, at 45 ° C flow temperature 174/265 W / m and 70 ° C flow temperature 465/620 W / m; RadiaSanCal heating register at a flow temperature of 45 ° C 115 W / m and a flow temperature of 70 ° C 310 W / m (in this case the heating registers are only pushed on and locked in after the copper pipes have been installed); Variotherm at 45 ° C flow temperature 85–240 W / m and at 70 ° C flow temperature 250–660 W / m; Ekowand skirting heating strips at a flow temperature of 45 ° C 100 W / m and at a flow temperature of 70 ° C 300 W / m
- ↑ Other manufacturers : Bavarian radiation heat ; Climaboard from Klimaboard GmbH ; Logitherm ; Oecotherm ; Hypothermal ; Cuprotec ; Radia-Therm ; New territory ; Energy-Com ; PERFECTA heating strip ; SlantFin baseboards , In: HaustechnikDialog.de
- ↑ Example calculation: For a room with 1500 watt heating demand, 3 to 6 meter heating strips or alternatively a plate radiator type 33 with a length of 1 m and a height of 60 cm are required at a flow temperature of 60 degrees. In: Fachwerk.de
- ↑ Thermaskirt heating strips, depending on the model, at 45 ° C flow temperature 50–100 W / m and at 70 ° C flow temperature 130–240 W / m.
